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首页> 外文期刊>Catalysis science & technology >Dielectric barrier discharge plasma grafting carboxylate groups on Pt/Al2O3 catalysts for highly efficient hydrogen release from perhydro-dibenzyltoluene
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Dielectric barrier discharge plasma grafting carboxylate groups on Pt/Al2O3 catalysts for highly efficient hydrogen release from perhydro-dibenzyltoluene

机译：PT/AL2O3催化剂上的介电屏障排放等离子移植羧酸酯基团从旁氢苯甲酰苯释放出高效的氢

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摘要

The key issues for the use of dibenzyltoluene (DBT) as a liquid organic hydrogen carrier (LOHC) are the high dehydrogenation temperature and the sluggish hydrogen releasing rate. Therefore, highly active catalysts are urgently needed for the dehydrogenation process. Towards an increased perhydro-dibenzyltoluene (H18-DBT) dehydrogenation rate, dielectric barrier discharge (DBD) plasma pretreatment was adopted to modify Pt/Al2O3 catalysts. As revealed by various characterization methods, methyl, methylene and carboxylate groups were grafted on Al2O3 and S2− and SO42− groups were grafted on Pt/Al2O3 after DBD plasma treatment. The Pt dispersion, the different proportions of different crystal planes, the low coordinated Pt sites and hydrogen spillover on the catalyst surface were modified. The catalyst with carboxylate groups showed the highest dehydrogenation productivity and produced the least amount of by-products. These improvements in the catalysts' performance were confirmed and are attributed to the higher proportion of exposed Pt (1 1 1) and Pt (1 0 0) planes, fewer low coordinated Pt sites and more hydrogen spillover.
机译：使用二苯二苯甲苯（DBT）作为液体有机氢载体（LOHC）的关键问题是高脱氢温度和缓慢的氢释放速率。因此，在脱氢过程中迫切需要高度活性的催化剂。为了增加旁苯二甲酰苯甲苯（H18-DBT）脱氢速率，采用了介电屏障放电（DBD）血浆预处理以修饰PT/AL2O3催化剂。如各种表征方法所揭示的那样，在DBD血浆处理后，将甲基，甲基和羧酸酯基在Al2O3和S2-和SO42-基上接枝在PT/AL2O3上。 PT分散液，不同的晶体平面，低配位的PT位点和催化剂表面上的氢溢出。羧基的催化剂显示出最高的脱氢生产力，并产生副产品量最少。确认了催化剂性能的这些改进，并归因于暴露的PT（1 1 1）和PT（1 0 0）平面的较高比例，较少的低配位PT位点和更多的氢溢出。

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